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Silicified stems of upper Paleozoic plants from the Intra Sudetic and Krkonoše Piedmont basins
Mencl, Václav ; Sakala, Jakub (advisor) ; Pšenička, Josef (referee) ; Florjan, Slawomir (referee)
The late Paleozoic deposits of the Czech Republic are famous for their rich occurence of silicified stems. Despite the fact they have been often described and are well-known among scientists and collectors, their modern evaluation is lacking. This work summarizes results of recent anatomical and paleoenvironmental studies of silicified stems of the Intra Sudetic and Krkonoše Piedmont basins, where are these fossils found very frequently. Based on field research and review of public and private collections, the presence of silicified remnants was proved in several stratigraphic units. Firstly, this work deals with silicified stems of calamitaleans, which are known from the Ploužnice Horizon of the Krkonoše Piedmont Basin, and some gymnosperms. Based on anatomical studies of the secondary xylem and other related features there were found two species of calamitaleans: Arthropitys cf. bistriata and Calamitea striata. Secondly, the more abundant Agathoxylon - type of wood was divided into two groups, which are assigned to cordaitaleans, and conifers. The palaeoenvironmental conditions were partly reconstructed according to sedimentary structures and also according to cordaitaleans - conifers ratio in each wood-bearing layer. Powered by TCPDF (www.tcpdf.org)
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Morphology and evolution of selected groups of Palaeodictyopterida (Insecta: Palaeoptera)
Pecharová, Martina ; Prokop, Jakub (advisor) ; Hodunko, Roman (referee) ; Sroka, Pavel (referee)
Palaeodictyopterida is remarkable insect superorder, which formed a significant part of the diversity of upper Palaeozoic insects, but disappeared by the end of the Permian. The main synapomorphy of the superorder is the piercing-sucking mouthparts in the form of a rostrum consisting of five styles. This rostrum was probably used to pierce on plant tissue and for the juice sucking. The same type of mouthparts shared by adults was present also in larvae of Palaeodictyopterida. The external copulatory organs of the superorder members was also showed some morphological interests. The male genitalia consist of a pair of gonostyli and two penial lobes, similarly to the genitalia of recent Ephemeroptera. The female genitalia of Palaeodictyopterida are developed in a form of the ovipositor that can be compared with the endophytic ovipositor of some recent Odonata. This morphological features support placement of Palaeodictyopterida as sister group of Odonatoptera + Panephemeroptera. The main aim of the work was to describe new representatives of the order Megasecoptera, the second largest group of Palaeodictyopterida. Wing venation of Megasecoptera exhibits a reduction of the longitudinal and transverse veins in comparison with the order Palaeodictyoptera. Other body structures were examined mainly in the...
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The upperpalaeozoic amphibians [Amphbia] of the Boskovice Graben.
Krejčí, Martina ; Mazuch, Martin (advisor) ; Zajíc, Jaroslav (referee)
The topic of bachelor thesis is upper paleozoic amphibians of Boskovice furrow. Boskovice furrow is long asymmetric furrow, which bedrock is made by rocks of moldanubicum, moravicum and brunovistulicum. Furrow is full of permocarbonifeorus sediments with relicts of mesozoic sediments in overlying rocks. In this regional unit, there is terrestrial sediment with fluvial and fluvio-limnic character, also there are coal formations. The amphibians are in a few formations. We can found only Labyrinthodontia in Boskovice furrow. We found from Labyrinthodontia representatives of two infraclasses: Temnospondyli and Anthracosauria. Final number of species in this geological unit is seven for now, but we can describe some new species in the future
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Silicified stems of upper Paleozoic plants from the Intra Sudetic and Krkonoše Piedmont basins
Mencl, Václav
V. Mencl: Zkřemenělé stonky svrchnopaleozoických rostlin z vnitrosudetské a podkrkonošské pánve 5 Abstract The late Paleozoic deposits of the Czech Republic are famous for their rich occurence of silicified stems. Despite the fact they have been often described and are well-known among scientists and collectors, their modern evaluation is lacking. This work summarizes results of recent anatomical and paleoenvironmental studies of silicified stems of the Intra Sudetic and Krkonoše Piedmont basins, where are these fossils found very frequently. Based on field research and review of public and private collections, the presence of silicified remnants was proved in several stratigraphic units. Firstly, this work deals with silicified stems of calamitaleans, which are known from the Ploužnice Horizon of the Krkonoše Piedmont Basin, and some gymnosperms. Based on anatomical studies of the secondary xylem and other related features there were found two species of calamitaleans: Arthropitys cf. bistriata and Calamitea striata. Secondly, the more abundant Agathoxylon - type of wood was divided into two groups, which are assigned to cordaitaleans, and conifers. The palaeoenvironmental conditions were partly reconstructed according to sedimentary structures and also according to cordaitaleans - conifers ratio in each...
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Morphology and evolution of selected groups of Palaeodictyopterida (Insecta: Palaeoptera)
Pecharová, Martina ; Prokop, Jakub (advisor) ; Hodunko, Roman (referee) ; Sroka, Pavel (referee)
Palaeodictyopterida is remarkable insect superorder, which formed a significant part of the diversity of upper Palaeozoic insects, but disappeared by the end of the Permian. The main synapomorphy of the superorder is the piercing-sucking mouthparts in the form of a rostrum consisting of five styles. This rostrum was probably used to pierce on plant tissue and for the juice sucking. The same type of mouthparts shared by adults was present also in larvae of Palaeodictyopterida. The external copulatory organs of the superorder members was also showed some morphological interests. The male genitalia consist of a pair of gonostyli and two penial lobes, similarly to the genitalia of recent Ephemeroptera. The female genitalia of Palaeodictyopterida are developed in a form of the ovipositor that can be compared with the endophytic ovipositor of some recent Odonata. This morphological features support placement of Palaeodictyopterida as sister group of Odonatoptera + Panephemeroptera. The main aim of the work was to describe new representatives of the order Megasecoptera, the second largest group of Palaeodictyopterida. Wing venation of Megasecoptera exhibits a reduction of the longitudinal and transverse veins in comparison with the order Palaeodictyoptera. Other body structures were examined mainly in the...
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Upperpaleozoic amphibians of Boskovice Graben in collection of the Chlupáč museum
Krejčí, Martina ; Mazuch, Martin (advisor) ; Zajíc, Jaroslav (referee)
The history of research on the Late Paleozoic amphibians at Faculty of science of Charles University in Prague coincides with the 50th of the last century, when it was acquired rich collection material from field collection prof. Špinar. This is connected with the necessity of cataloging and processing of this material. The catalog alone contains large amounts of material, 3,237 pieces of items that will be the basis for subsequent research directions in the fields of morphology, anatomy, taxonomy, biomechanic and more. The most numerous species in collections is discosauriscus austriacus.
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The upperpalaeozoic amphibians [Amphbia] of the Boskovice Graben.
Krejčí, Martina ; Mazuch, Martin (advisor) ; Zajíc, Jaroslav (referee)
The topic of bachelor thesis is upper paleozoic amphibians of Boskovice furrow. Boskovice furrow is long asymmetric furrow, which bedrock is made by rocks of moldanubicum, moravicum and brunovistulicum. Furrow is full of permocarbonifeorus sediments with relicts of mesozoic sediments in overlying rocks. In this regional unit, there is terrestrial sediment with fluvial and fluvio-limnic character, also there are coal formations. The amphibians are in a few formations. We can found only Labyrinthodontia in Boskovice furrow. We found from Labyrinthodontia representatives of two infraclasses: Temnospondyli and Anthracosauria. Final number of species in this geological unit is seven for now, but we can describe some new species in the future
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Silicified stems of upper Paleozoic plants from the Intra Sudetic and Krkonoše Piedmont basins
Mencl, Václav ; Sakala, Jakub (advisor) ; Pšenička, Josef (referee) ; Florjan, Slawomir (referee)
The late Paleozoic deposits of the Czech Republic are famous for their rich occurence of silicified stems. Despite the fact they have been often described and are well-known among scientists and collectors, their modern evaluation is lacking. This work summarizes results of recent anatomical and paleoenvironmental studies of silicified stems of the Intra Sudetic and Krkonoše Piedmont basins, where are these fossils found very frequently. Based on field research and review of public and private collections, the presence of silicified remnants was proved in several stratigraphic units. Firstly, this work deals with silicified stems of calamitaleans, which are known from the Ploužnice Horizon of the Krkonoše Piedmont Basin, and some gymnosperms. Based on anatomical studies of the secondary xylem and other related features there were found two species of calamitaleans: Arthropitys cf. bistriata and Calamitea striata. Secondly, the more abundant Agathoxylon - type of wood was divided into two groups, which are assigned to cordaitaleans, and conifers. The palaeoenvironmental conditions were partly reconstructed according to sedimentary structures and also according to cordaitaleans - conifers ratio in each wood-bearing layer. Powered by TCPDF (www.tcpdf.org)
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Silicified stems of upper Paleozoic plants from the Intra Sudetic and Krkonoše Piedmont basins
Mencl, Václav
V. Mencl: Zkřemenělé stonky svrchnopaleozoických rostlin z vnitrosudetské a podkrkonošské pánve 5 Abstract The late Paleozoic deposits of the Czech Republic are famous for their rich occurence of silicified stems. Despite the fact they have been often described and are well-known among scientists and collectors, their modern evaluation is lacking. This work summarizes results of recent anatomical and paleoenvironmental studies of silicified stems of the Intra Sudetic and Krkonoše Piedmont basins, where are these fossils found very frequently. Based on field research and review of public and private collections, the presence of silicified remnants was proved in several stratigraphic units. Firstly, this work deals with silicified stems of calamitaleans, which are known from the Ploužnice Horizon of the Krkonoše Piedmont Basin, and some gymnosperms. Based on anatomical studies of the secondary xylem and other related features there were found two species of calamitaleans: Arthropitys cf. bistriata and Calamitea striata. Secondly, the more abundant Agathoxylon - type of wood was divided into two groups, which are assigned to cordaitaleans, and conifers. The palaeoenvironmental conditions were partly reconstructed according to sedimentary structures and also according to cordaitaleans - conifers ratio in each...
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